Celebrity gossip blogger Perez Hilton even weighed in, saying he was “upset” by the pricing. He argued that even if the larger shirt sizes might be slightly more expensive to produce, it didn’t justify a $5 price difference.

Other fans defended the singer, pointing out that she almost certainly does not personally set the prices of her tour apparel.

I can assure you she doesnt set nor know the prices of her tour merch. Chill gurl! She’s an advocate of self love and would never discriminate against anyone.

Soon after the photo from her Florida show went viral, Live Nation Merchandise, the company that handles Aguilera’s tour sales, cleared up the controversy.

“There was an error in merchandise size pricing at one of the Christina Aguilera shows," the company said in a statement to NBC News. "Christina and her team were not aware of this and the costs have been adjusted appropriately."

Prices are also the same across the board for the shirts available on Aguilera’s official website.

These items from Aguilera's "Liberation Tour" cost the same across sizes on her official website. shop.christinaaguilera.com

Aguilera, 37, has been busy traveling the country for her "Liberation Tour," her first tour in more than a decade.

“The last time I was on tour I was pregnant with my son,” she told TODAY in June, referring to her 10-year-old son, Max.

"I was like, 'Mama's got to get back to what I do best,'" she said. "I have to get back on the road, I have to get back to my fans.”